A Mumbai woman committed suicide by jumping off the seventh floor of a building along with her 6-year-old son in suburban Dahisar today. Dipti Chauhan and her son Siddhu died on the spot. The Mumbai police have now arrested Dipti's husband, father-in-law, brother-in-law and sister-in-law for abetting the suicide. They will be produced at the holiday court tomorrow at Bandra.