Child support?

I have a 3 year old . The father of my child is married as I was unaware he was married at the time and he also denies being the father. Do I have a r

I have a 3 year old . The father of my child is married as I was unaware he was married at the time and he also denies being the father. Do I have a right to a paternity test and child support as I haven't done anything about this till now. Also my child's father has children my age do they have a right to know about there half sibling

or:I have a 3 year old . The father of my child is married as I was unaware he was married at the time and he also denies being the father. Do I have a right to a paternity test and child support as I haven't done anything about this till now. Also my child's father has children my age do they have a right to know about there half sibling

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