A child is obligated to take care and provide for their parents when they are old and unable to look after themselves, just as the parents are obligated to care and provide for their children when they are young and under their watch. Making our parents happy as much as possible(provided what they expect from us is not something unjust and wrong) and/or not causing them pain and grief is our duty.
However not always will this be easy. Take for example my own parents. They are divorced(by the way they had a love marriage), and hence not living under the same roof themselves. And whilst my mom has plenty of relatives around her, she does need financial help since she stopped working. Dad on the other hand has plenty of money of his own, but lacks company and often feels lonely. They both therefor have very diverse needs, and since I am not in SL and have no plans of ever going back, whilst I can give my mom what she needs, I'm unable to be there for my dad!
It is a tough situ yes...but thankfully my dad wants also to see me happy as does my mom, so he will not like that I feel forced to come back just for him.
Back to the OP...if there is one thing I have learned from my own marriage, and the marriages of those around me is that the future of any marriage can never be predicted, regardless of whether it was arranged or love. What matters is love,mutual understanding, compatibility and trust between the spouses, which can either grow stronger with time or weaken from the word go!