Baptists, like Anglicans, run a pretty wide spectrum of belief and practice. Some Baptist churches can be fairly formal, with hymns you'd recognise, and eucharist (communion) pretty much every week. Others are very, very low church, practically Pentecostal, with nothing resembling a liturgy and communion maybe twice a year.
But basically I think the summary in the OP is pretty good. I was raised in Baptist churches by a rampantly anti-Anglican father and a secretly-still-Anglican mother, and I now worship in a traditional Anglican parish while attending a Baptist-run Bible college, so I'm pretty familiar with the similarities/differences but still not as up on Anglican beliefs as I probably should be. So here are my comments:
1 - This is probably the main problem Baptists take with Anglicans. My father talks about infant baptism as a "deception he was delivered from", so that's... a fairly typical Baptist opinion on infant baptism. Baptists generally won't baptise anyone under about twelve years of age (I was six or seven when I decided I wanted to be baptised, and made to wait quite a few years because I "wasn't old enough to make that decision"), and always full immersion. To baptise babies is considered "popery" and referred to as "christening" or, even more derogatorily, "sprinkling".
2 - Baptists have no hierarchy. Whatsoever. I'm still not entirely clear on what "apostolic succession" is, although I have a fairly good idea, so that should indicate how much of it Baptists have. Authority in Baptist churches doesn't extend beyond the local congregation, although there might be some "unions" or "conferences", there are certainly no parish councils, dioceses, or synods. There might be well-known preachers considered semi-authoritative by lots of churches, or a Bible college / seminary with a bit of sway, but that's it.
Baptists would consider Jesus - and Jesus alone - to be the head of the Church (citing passages like 1 Corinthians 1 and so on, and not really knowing how to react on topics such as Peter as the foundation or James as the first bishop) and don't take authority-figures well (although, you know, the Anglican hierarchy is pretty horizontal and seems to involve a lot of committees of lay people, so I'm not sure what the problem is). As one of my lecturers likes to put it, "Baptists were born out of schism and have a very weak ecclesiology".
3 - "Sacrament" is another one of those words which Baptists will dismiss out of hand as "popery", but sacraments such as baptism, marriage, communion, ordination ("commissioning"), and anointing of the sick all still exist to varying extents. Any sort of statue, icon, or imagery is considered idolatory, although most Baptist churches will make liberal use of text (Bible verses), graphics, and pictures of flowers and landscapes in the place of worship.
4 - This is the only point I disagree with. I don't think there are many Baptist churches which celebrate communion weekly (one of the main issues my grandfather, an Anglican priest, takes with them), but certainly most will do it monthly at least, and some fortnightly. It's usually a loaf of bread and some grape juice, though, and not wafer and wine. They're usually passed around on little trays from pew to pew, so frankly I find the Anglican method (queuing, kneeling) a lot tidier! This is also one of the only places where Baptists have something resembling a liturgy - 1 Corinthians 11:23-25 is usually read as communion is given.
5 - I never encountered the Creed in a Baptist church, outside of a praise chorus which has become popular recently (see
), but I expect most Baptists would agree to it. Probably the only council which is recognised would be the Jerusalem Council in Acts 15, but churches would also point to various Confessions of Faith, such as the 1644 and 1689 confessions - a church's given "Statement of Faith" is usually taken from one like that.
As a generalisation - because, as in point 2, there are no absolute statements for every Baptist church - Baptists believe the Bible as divinely-inspired, without error, and interpret it pretty literally. This doesn't mean that everyone interprets it the same, though! (I know that, in the US particularly, Baptists can get pretty divided over Calvinism). But a lot of things are taken pretty much as-read. A lot of Baptists definitely hold to verbal inerrancy, and some can be pretty rabidly KJV-only and take *that* literally rather than the original language...
6 - I'm adding this one. Baptists can be highly suspicious of any sort of memorised "rote" prayer. The BCP is seen as more of a hindrance to worship than a help, hymns and chants are dreary and the latter possibly occult, and I won't even start on what's thought of the liturgy. I don't know that this is actually a difference in faith or belief, but just something to be aware of as an Anglican in a Baptist setting.
But, anyway, when you visit your relatives, it would be best I think if you could tell them all the ways in which Anglicans and Baptists are the *same*. A lot of Baptists regard Anglicans with no small amount of suspicion and consider them basically Catholics (which is basically tantamount to following the Antichrist in some circles). When it comes down to it, there are fewer differences between Anglicans and Baptists than Baptists like to think.
I've probably been going on too long, and not said anything new to anyone, so sorry about that. It's just something I've been thinking about *a lot* recently, so I may have seized on the topic a little too voraciously...