I lost my father and now it’s more than five years have passed. when he was alive I remember very clearly that he was not very regular with his namaaz and so after his death, his qazaa namaaz has to be prayer about which I have no clue as to how many years they have been qazaa for. As I am elder son, it is obligatory on me to pray his qazaa namaaz. My question is for how many years I am supposed to pray his qazaa namaaz?

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If you don’t know how many years he missed, just go with what you are certain of. Anything more than that you don’t need to make up. If you are certain he missed 1 year, but you’re not sure he missed more, then make up only one year. It’s also good to ask your siblings to help out.