Looking for last name McNamara in Tipperary.

Hi,

My name is Niamh Elizabeth McNamara (17)and have a brother named Joseph Phillip McNamara (19)I am from and live in Teesside England, I am the daughter of John Joseph McNamara born 25th May 1973 and Sarah McNeill. I am led to believe my dad, John Joseph McNamara, was born in Tralee and then his family are now in Tipperary. I have attempted to find relatives but I do not know his mothers (my grandmothers) name but I do know his dad is called John McNamara and he may have a sister called Margaret. I have also been told of his grandmother (maybe) called Elizabeth (Lizzie) McNamara.
Please can someone give me some information as I have been searching for a while now and have had no luck so far. Thank you so much!