Honestly, I have been reading these pots and so far, I am not seeing what the big deal is.
To the OP, you have asserted several times your right to vent, so allow me to reply to your vent, which is well within my right.
I don't see what the big hubbub is about, it seems that you are having a big grudge and going on about really something that has little importance, you can assert your claims that the in-law is a person who expects a lot of things, but then again she is an elderly woman who probably looked forward to your son calling him. Maybe she has nothing else to do and grandkids are a big deal with her. The telephone call wouldn't of been that long besides, he could call the next day,true. So there really isn't anything to freak out about. You are making a big deal out of nothing. There may be drama between you and the in law, but the more you let it bother you, the more grudge there will be.
You will probably reply vehemently to my posts as you have to the others, so let me just type ths. There is no big deal from this, you are making too big of a deal and there is another story to this besides yours, so honestly. Let something like a phone call go, as long as your son calls the next day, there really isn't anything to bark at.
People make allowances for children and the elderly, maybe you should too. I don't know the whole drama situation with this family member, with this only to go on all I can say is..let it go and grow up. The fact that you are replying to almost ever post on here, asserting your right is showing that you are knawing this thing to the bone.