My mother and step-father are in the middle of a divorce, can he press felony credit card fraud charges against her?

My step-father stored his visa debit card as a payment option on the pay-per-day telephone my mother has. Since they seperated, he's been placing online payments for her to have minutes on the phone so he can text her. Last month, while trying to use her own visa debit card to put minutes on her phone, she chose to use a stored payment option using a visa card, of which the numbers were not shown. It turned out to be my step-father's debit card and not hers, for a total of about $70, which he never asked her to pay, and didn't know about until a month after the fact. Now he's threatening to press credit card fraud charges against her for an arrest warrent so that she can not gain custody of my younger siblings. Can he do it and is there anything we can do to make sure no one gets arrested? - Is this your question? Add additional information