I disagree -- mom may not get custody due to the fact that dad has sole custody. That was given to dad for a reason. If the court is aware of mom's drug history and mental illness history, she may get no more than visitation -- especially after an absence. How long is dad gone?
Parents should remember 3 things: Love your kids more than you hate your ex; when you have children the relationship with the other parent is until death; your children determine what type of nursing home you end up in.
Nothing stated by me should be taken as giving you legal advice or forming an attorney/client relationship.
Attorney-GAL in Ohio.
I've removed the knife from my back, polished it, and will one day return it -- long after you think I have forgotten.