Re Dad: Next time, add up all the hours you spent on a project, and all the $ for supplies etc. Then ask him how much he thinks folks would pay. Deduct your expenses and when it turns out you'd be working for $0.37/hour, he'll get the picture.
Re Sis: I'll bet she's been picking at you your whole life and has not just started with the quilting. Maybe you should give her a small quilt kit for her BD and let her try it. You could give her some encouraging remarks!