Married life is a unique blend of – Love/Commitment and it its core, love is a decision to be committed to another person. Whereas the essential love, patience/forgiveness and respect helps to enjoy.
Pitru dosh is a karmic debt of Ancestors. Person who is facing problems in the present life are all because of neglect to the ancestors and the origin of problems are the results of annoyed forefathers, so now person is going to pay the karmic debt .
Rahu is a top graded malefic planet, it may give you good results or may cause lots of problems during it’s Mahadasha phase. Though it depends on it’s positioning in the natal chart, if it is afflicted or ill placed in the chart then it will results adversely during Mahadasha phase, whereas good or neutral positioning in the chart may tend to results as per it’s strength or positioning in the chart. So results may vary as per the conditions of it in the chart.