A sister in law's cousin

My sister in law Hillary has a cousin I cannot stand and all she does is criticize the crap out of my son and I. My son whom is 16,he loves wearing girl's jeans and I support him on this. He started this last year and she thinks it is weird thinking I made him this way. I told her that was not true and he discovered this on his own loving it. Plus she cannot stand seeing my left lower leg, wear a prosthetic leg due to my left lower leg was amputated below the knee after I was shot there shattering the bone during my 3rd tour in Iraq while in the Marines. Hillary, she is furious with her being cruel to both of us. Good thing is she sees my son happy and supports him as well knowing this is who he is which cannot be changed. Me, she has told her it is not gross for me wearing a prosthetic leg getting around.