Someone tell me not to speak my mind..

I've had it up to here with my DiL. She seems to feel that I 'do too much' for my DD and her family and always making snide remarks about them. My son earns a very good wage and DiL only works 3 mornings a week, whereas my DD is a full time secondary teacher, and her husband works shifts. So I often have to drop her boys at school and pick them up.

I'd like to think that perhaps she had my best interests at heart, but I'm feeling more and more that she is jealous of the amount of time I give to my daughters children. But I do drop her oldest at school, have them overnight if need be and childmind her youngest once a week. I'm even beginning to wonder if she is suffering from some mental health problem.

But what is really getting to me is the poison she is feeding my DS. He is now beginning to sound like her.

Yet every so often she'll text me and say 'love you xxx'. I'm totally comfused. But there has been an incident again this weekend and when my DS drops his daughter off for me to childmind tomorrow I'm on the verge of telling him exactly how I feel and to hell with the consequences.

Someone please tell me to calm down and keep schtum. .