James Kottak asks judge for custody of his son

Scorpions rocker James Kottak has asked a judge to hand him primary custody of his son over allegations his ex-wife is an unfit mother.

The drummer filed documents at Los Angeles County Superior Court earlier this month (Sep12) requesting his 15-year-old son with Tommy Lee's sister Athena Lee is transferred to his care full-time.

He has also asked for his $1,466 -a-month child support payments to be reduced as his earnings are not set in stone and his son lives with him most of the time.

The suit alleges Lee is an alcoholic who has been in and out of rehab.

According to TMZ.com, Lee claims she allowed her son to live with her rocker ex so he can remain in his school district and that she has been sober since January (12).

The pair also has two other children together.

A judge is yet to rule on the request.