son in-law

Q: Please advise if a son in law can be a mahram for his mother in law in performing umrah.

Q: What remedial measures does one have to take if the son-in-law has been advancing and inviting his mother-in-law for sexual pleasures. He also reveals this to his wife that he is thinking of her mother during family life in bed. Is the marriage alive? The discord of his wife became unbearable and brought the subject to me (paternal uncle) and another cousin of hers. Both, the wife and her mother (my sister-in-law) have come with this complaint. And I am disturbed and helpless. I referred to Suraah No 58 first 5 verses and found it be a very admonishing sin and after hearing from another brother in Islam (source). Is it almost one talaq? Is the marriage still alive? The girl, my niece, does not want to live with this man any further. She is seeking separation (Khula). Keeping in mind her father's financial constraints and health and for the livelihood future of hers and her young age (sinners wife) children's future, we want the marriage to be kept alive. Please help with appropriate reply. 

Q: I have a very weird question and you may think I am being irrational but please hear me out. I am married to my husband of 4 years and we have a young infant. I have been noticing for the past year or so that my Mother has taken a liking to my husband. And it is not in a civil Mother in law way, she likes him romantically. I have thought I could be misled and confused but this is why its taken me a year to be fully convinced. I will explain some of the things she does to clarify my assumptions. Firstly i do not live with my parents I stay there every school holiday. My Mum has become very nosy if i am on my phone she comes to look at it. If i am alone in my room with my daughter and my husband video calls she would barge in and interfere (take note she pulls my daughter and gets on the video to him). She always takes my phone. When my husband comes she tries to get his attention she walks by him from the next room in a way where she cant see me but she looks at him. Another thing is she is absolutely furious when i tell her that my husband is loyal. Take note she is always trying to cause problems e.g. his family are bad to you. She wants me to tell him and it always causes us to fight and its silly things. She does this when nobody is around. She also tries to get him closer to my sisters. For example my husband eight now is on holiday so my mum asked me if hes enjoying it and i had told her that he is actually bored. The next thing i see is she rings my sister and tells her that my husband is bored he needs someone to talk to. Basically indirectly telling her to call him. She tries to make me jealous with my own husband. Bare in mind i think my husband knows this i am sure she told him things in my absence. He has told me that my mum is bad so i'm sure he knows. There are so many examples but those are basic things i have noticed. She acts like she is his 'thauba' wife because when my brothers want to eat she acts like it is not her job. She takes my daughter and acts as if shes here to visit. She doesnt like me bonding with my child. Please help me is there a dua or something i can read on her? I trust my husband but i feel like what if he listens one day. I hate to say this but she is acting like a shaythan always trying to come in between our marriage.