Harassment by inlaws and interference in children's life

interference by mother-in-law to manipulate the teachers where my children studied during school days,now interfering in college where son studies,paid bribes to lecturer ,to get her to represent my mother-in-law as the victim,instead of 'me',and harassing my son,to get dejected ,and discontinue college,because the lecturer in the end ,said he can't take his second semester exams because of shortage of marks,and also,manipulation of his exam marks in first semester at university,where the lecturer is doing her ph.d..reason for this harassment that i do not send my children to tiruvottiyur ,where in-laws live.