Dear Prabhakar,
Your son has a first class horoscope with a net strength of 63.64%. His marital bliss is 57.11% which is rather very good in these days of ever increasing incompatibilities between husband and wife.
Do not worry, you will have no causes for worrying about your son’s marriage and their post marital relations with you.
Perhaps you will understand my evaluations better if you read my blog http://www.navagrahastro.blogspot.in/ , particularly the one related to marriages.