Can I legally prohibit my brother-in-law from entering my mother's condo to retrieve clothes for his child and anything else?

Question Details: My sister passed away recently. She was squatting in my mother's condo for the last 18 months after my mother passed. Her estranged husband has lived with a woman for some time. They have a special needs child too. Can I legally withhold my brother in-law from entering my mothers condo to retrieve clothes for his child and anything else (i.e. LCD TV, various electronics with little value)? Some bills (e.g. phone and cable) are currently in my name and I'd like him to pay these prior to entering the condo. Can I ask him for money and say, "Pay me and you can enter" or does he have a right?

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