As a follow up to the question about sons, is there a similar idea to the number of daughters? Since in westeros women are marriage pawns, and there are only so many men they can reasonably marry, is one enough to cement a tie, and then sons all the rest of the way? Furthermore, is the ideal family one lord, one lady, one daughter, 2-3 sons?

Again, depends on the family, because the limiting factor with daughters seems to be dowries. If you can splash out for a lot of daughters, then they’re a bonus because you can make ties to more families than just the one – if you can’t splash out, you’re in trouble. As Dickens wrote, “"Annual income twenty pounds, annual expenditure nineteen [pounds] nineteen [shillings] and six [pence], result happiness. Annual income twenty pounds, annual expenditure twenty pounds ought and six, result misery.“