separation from Irish Spouse and parent of irish child

im separated from my irish spouse and i have astamp 4 based on her . i would like to get stamp 4 based on my irich child that lives with her before my gnib will expire next year .
will i have right to get new stamp based on my irish child even we are seperated ?
please someone can give me advise or he have been in the same situation or knowing someone who had the same process .

thanks