can i claim my dad's support/

Atty.,
I am now 38 years old.An illigitimate child grew up with my lola a mothers side both my mother and father have their own families. My dad never give any support for me since my birth, some hearsays that my father wants to five anything but my lola rejected, i dont know how true it is. till such time that i found my dad and everytime i went to his office he only give me 500 pesos.
and i read an article that an illigitimate child have the rights to claim a share from her father,.
I want your advice on how can i claim my dad's support.
Your respose is highly appreciated.
Thank you so much.

did he sign your birth certificate?

thanks for your time to reply.
no he did not sign anything apeared in my BC was illigitimate.
Do i Have the rights to claim anything?

you will first have to get him to admit he is your father in an affidavit or you have to file a petition to establish your filiation.

it means that i have to go to an atty to process my case?

only if the father refuses.