Are you guys close?
If you are close enough to ask for "Quality time - Just the two of us" without it being weird, then try that. You may have to compromise and spend the day with her alone, but have him along for dinner, or viseversa.
If you are close enough to ask for "Quality time - Just the two of us" without it being weird, then try that. You may have to compromise and spend the day with her alone, but have him along for dinner, or viseversa.