Can a deceased wife's family lay claim over the property of both hers and the still living husband's?

Question Details: My grandfather-in-law just recently lost his wife quite suddenly. Her children from a previous marriage are now trying to swoop in and lay claim to almost everything that was solely his as well as things he and his wife shared through marriage. One of the children even went so far as to say one of her mother's guns was missing so she stole 2 of my grandfather's guns registered to him and took them to her house. Is there anything we can do to keep my grandfather from losing his property and are they even allowed to lay claim over anything since he was married to her and still living?

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