The battle for custody of child actress Ariel Winter rumbles on, with her mother Chrystal Workman’s attorneys apparently questioning Winter’s sister Shanelle Gray about her drug usage, in the hope that they might be able to use any admission against her when it comes to trying to prove she’s a bad guardian.

TMZ reports that Workman’s team were specifically asking Gray about her potential consumption of cocaine. Modern Family star Winter is currently at her sister’s following reports of mistreatment at the hands of her mother, but Workman is unhappy about the arrangement and is seeking to regain custody.

Workman’s attorneys came away frustrated after Gray didn’t offer up any answers that suggested any particular problem. She told them that she only tried cocaine once – in 2005 or 2006 at a party. The drug was apparently laced with something else and she ended up feeling sick from it. Gray was also questioned about whether she had ever received any DUI convictions; she said she was pulled over in Los Angeles – again either in 2005 or 2006 – and given a ticket on a night where she’d had “one glass of wine”. It was eventually thrown out after judges decided that her alcohol level was too low. It looks like Workman’s team are going to have dig a little deeper to find anything incriminating.