Good evening i am a stepdad my wife had 2 boys age 12 and 14 from a previous marage but she passed a…

Good evening i am a stepdad my wife had 2 boys age 12 and 14 from a previous marage but she passed away in 2018 myself and the biological father decided that it whould be best for the boys to stay with me as they has been with me since 2009 after my wifes death he stopped paying maintenance and up to now did not contribute financialy he also refuse to go to court to make me the legal guardian what rights do i have as he only see them from time to time 

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