I definitely would make the quilt. Dad has been very kind to you and it sounds like you want to do something nice for the baby. His wife may have social anxiety, she may be very private, or maybe she really is unfriendly. But she is having a baby and hopefully will appreciate that someone else is excited for this new little person in the neighborhood. The quilt may be an icebreaker, or she may never acknowledge it, but Dad will definitely appreciate it.