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There are two reasons to consider removing yourself from that card as an AU.
First, % util is one of the higher-weighted scoring factors, and a 90% util is likely hurting your overall score.
Second, the presence of any AU account in your report automatically means that your score is no longer representative of your own personal risk assessment.
Some creditors will discount the value of any score if they do a manual review and see the presence of an AU.
Have you tried explaining this to your father? Sounds like he could use the help as well...
Your father is a credit card bank's dream...
You need to get OFF of his maxed out cards as a AU. It's probably doing you far more harm than it is doing good.. Whats keeping your scores down btw?