I don't know how old your daughter is, but try to think of a simple learning skill, which typically with autistic children needs much repetition and positive reinforcement, and ask your in-laws to work with her on that. They will understand both the effort needed and the excitement to be had in teaching their granddaughter an interactive skill.

You will need to be patient. There is little reason to direct your anger and frustration at them. I expect they feel they did their job in raising your wonderful husband and simply can't find a connection to your little girl. Many adults do come around, and with a little more time, learn to feel very close and loving toward autistic children. There is much we have learned about helping autistic children, but much that continues to be a mystery, particularly to those who are not with your daughter on a daily basis.

Dr. Sylvia Rimm