Be friends with your mother in law. But, not all mother in law - daughter in law bonds are great. One of my friend who knows about my cold relationship with my mother in law forwarded a lengthy message on WhatsApp about a girl who was advised to give her mother in law some medicines laced in food everyday and pretend to be nice. The daughter in law did what was advised thinking that her nosey mother in law would be out of her life soon. With every passing day the bond between them became so strong that the daughter in law started loving her mother in law and didn't want her to die. She went to the relative who had given her the medicine all teary eyed and begged to save her mother in law who then revealed that they were just sugar balls.
Image source : http://bit.ly/2INGrsB
Seems like a story out of Bollywood, but I don't think this happens in relation life. Most of the mother in law's think that their sons are avoiding them on the insistence of their wife which is not the case. They also want the daughter in law to look after the home and the family according to their standards which at times is not possible because the girl was born and brought up in a different family. These differences leads to irrectifiable clashes that are nurtured within the hearts for ages and turns into hate at one point of time.
Personally, I can never be friends with my mother in law. I know the feeling is mutual. I would never want to hurt her physically, but I honestly would also not pray for her to live long. Well, she is a toxic lady and my co sister shares similar feelings for her. I can say that sharing a loving bond with my mother in law is the perfect definition of impossible for us.