Is it permissible for a mother to travel with her daughters if only a mahram (a relative one may not marry) for her is with them?

The questioner:
May Allah reward you, Your Eminence, father. The questioner says: If a woman travels with her nephew and her daughters are with them, is he considered a mahram for them, or must there be a mahram for the daughters, such as their father or their brother?

The Shaykh:
If the daughters are young, there is nothing wrong with it, and a mahram is not required for them. However, if the daughters are adults, a mahram is necessary. It is not sufficient, and it is not sufficient, for you to have a mahram with you while they have nothing with them. And what is the question?

The questioner:
She says, may Allah reward you, if she went with her nephew.

The Shaykh:
Her nephew is her brother-in-law, meaning. Yes, indeed.

The questioner:
And her daughters are with her.

The Shaykh:
Her daughters are non-mahrams to her nephew, so a mahram is necessary for them. Yes.