Do I need to change my Non B visa after my girlfriend's death if I have two Thai children?

Hi, i am looking for some advice regarding my current visa situation, I currently have a Non B visa as i am working here. My Thai girlfriend recently passed away, although we were not married we have 2 children together, both born here in Thailand ages 12 and 15. I plan to stay here and continue working but as i have 2 dependent children who live me, is it necessary for me to change my visa.

Further information ( not sure if this is relevant or not )

Although my name is on both birth certificates, apparently i am not recognized as their legal guardian, this is something i am currently in the process of changing