The above is the chart of your Son. Capricorn lagan and rashi is Virgo. Rahu in the 7th house, Venus the karka for marriage, relationship and romance is 28 degrees hence vrid avasta.
Saturn and Mars in the 8th house. Mars in the 8th house makes him strong mangalik. If you see he has major planets posited in the 6th, 7th and 8th house. 6 planets in these houses. Maximum energy is concentrated in these house. This is not a good chart for marriage. The possibility of a successful marriage is weak. If at all he gets marriage again, he should get proper matching done for things to work properly.
Blessings,
Navneet Khanna
Astrologer