Hi, thanks for your question. As he had no will and you are noy.divorced the legal position ia that you inherit all his estate up to £260,000 and anything above this amount is divided 50% for you and 50% for his daughter. His personal possessions are also left for your benefit. As you are still married, if the home he passed away im is the former matrimonial home you have a right to occupy thisand therefore change the locks. In the circumstances I would suggest you urgently contact a local solicitor to assist given that his family have already taken steps to acquire and potentially dispose of his assets.
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Just to add to the above.
Whether or not it was the Matrimonial Home as the only person entitled to apply for Letters of Administration of the Estate you can enter the property and change the locks immediately. - as in today if necessary
The fact that his partner has not lived there full time limits any claim that she can make on anything other than items that were paid for from joint funds
You should ask them for the key as it is your legal right to enter. If they don't provide one you can seek assistance from a locksmith to enter
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