Daughter in-law travelling alone with her father in-law
Q: My sister in-law has gone with her 6 month old son to her parent's house for a holiday overseas. My brother had gone to leave her. Is it permissible if my father (her father in-law) picks her up and brings her back home and be her mahram if her husband is tied up with work? Also, is her father in-law allowed to be her mahram when travelling?