I really feel very annoyed went my mum always tell my Son to don't go near my Husband and always tell me that she doesn't allow me to have 2nd child with my Husband just because she don't like him..

It is your marriage and your husband. I would let it slide. Also I would tell her to stop saying such things to my son. That is not showing a good example. I'm sorry to hear that this is happening for you.