Suggestions as how to end the estrangement between disputing relatives

Her husband’s sister is causing problems for them

Does she have to visit the wife of one of her relatives?

If she tries to reconcile with her sister but she does not accept it, will Allaah accept her deed?

Their aunt wants to corrupt them; should they cut off ties with her?

Family problems

Is the father’s wife among the relatives (rahm) with whom one is obliged to uphold ties of kinship?

Is he obliged to attend the waleemah when there is someone there who will offend him with his words and actions?

His problems with his maternal uncle caused him to fail his exam; can he ask him for compensation?

Rights of brothers and sisters