false dowry turned to criminal

my brother married two years ago both are second marriage both had daughter of own .after marriage their daughters are maintained by their grandparents . since marriage they had quarels of having to live in separate family by their wife . but my brother don't like that . they lived a joint life for only two months . when leaving our home her brother's wife and her small mother took the jewels of his wife . we took a video shot of that. yesterday we got a letter from her . in that letter she said that the jewels are here .now shall we place theft of jewel case against them with that video shoot As evidence