IRA rollover to HSA

[gle318612]

An employee has an HSA...and the employee and her dependents continue to be covered by a HDHP. The employee's husband (one of the dependents covered by the employer plan (HDHP) of his wife) has an IRA with a small account balance. No IRA rollover to the employee's HSA has occurred. May the husband's IRA be rolled over to the HSA of the wife/employee in a trust to trust transfer subject to the employee's maximum annual HSA contribution amount based on the type of HDHP coverage (single or family) at the time of the rollover? The issue is that the IRA is that of the husband...not the wife/employee. I can somewhat read the guidance to allow this but I couldn't find such explicitly stated...don't know if there is other guidance on this matter or if there is general interpretation of the guidance to allow/disallow this type of rollover. Thanks.