Irineu Cruz and his wife Jucicleide Silva have a brood ranging from one month to 18-years-old - but the couple say they won't stop trying until a girl arrives.
During the first pregnancy , they agreed Dad would name the boys and Mum, the girls.
According to the Daily Mirror, Irineu has since christened all 13 boys after famous footballers - all beginning with the letter R.
The family, who live in Concei ao de Coit , Brazil, hoped their thirteenth child would be a game-changer but instead the midwife announced it was yet another boy.
"When Jucicleide first got pregnant we agreed she could choose the girls' names and I would choose the names if they were boys.The family's newest addition has been christened Ronaldo after the former Brazil star.
"Every lunch time I cook a kilo of rice, a kilo of beans and an extra-large packet of macaroni.With her large brood of boys, Jucicleide still dreams of naming a little girl one day.
"Of course there are times when things are tough but nobody ever goes hungry.
"If we have one loaf of bread, it's divided and shared between everybody.
"The good thing is that all my boys are well behaved."
"It would be wonderful to be able to choose her name and to finally hold up the red card to my husband.