Is there any legal action to be taken against my two sisters after but they broke in the vacant home, changed locks and took things from it?

The executor has the duty to secure the property of the estate. As executor you should change the locks so you control access. If the property taken from the home is valuable and was not to be distributed to those that took the property then the executor could file a citation to recover estate assets. The executor has broad discovery powers and can subpoena financial records from financial institution the decedent dealt with.

Yes. You can file a citation to discover assets, which basically allows you to demand documents and take a sort of deposition. If you uncover that they're withholding estates assets, then you file a citation to recover assets. As executor, you have counsel to advise you on matters like this.

Who owns the home. Who saw them go in. If the home is part of the estate and you are the executor appointed by the court, and went into the house without your consent, go to the police. Missing money cash bank withdrawals ..are treated very differently. Cash is hard to prove. Checks leave a paper trail.