How can I remove extremely dry oil based house paint from fabric

So about several months ago I was painting my nieces room while I occupied their room my mother decided to take them to do some clothes shopping. Not completely thinking it over I left all the painting supplies in their rooms to finish up the project the following day. Since they wouldn't be sleeping in their rooms until paint was completely dry. Long story shorten, the following day I notice everything had been moved around. So as I start to clean before starting I realize everything was in odd places to cover up spilled paint throughout the carpet. It even happen to generously get on 2 pair's of their brand new jeans a black pair of skinnies and a dark pair of blue jeans. Knowing there just has to be a day to remove the oil based paint I refused to trash them what can i do.