So sorry for your loss. I hope your children will appreciate whatever you come up with. I made one from the following link that someone had shared here on QB.
http://thethriftyquilter.blogspot.co...e-thrifty.html
It really turned out great. I did have to cut up one additional shirt to add to my backing. Pinterest also has quite a few great ideas for patterns using men's shirts. I actually went to the thrift store to buy several shirts to try a few different designs. Your children will be blessed with whatever quilts you make for them.