Even though Gwen Stefani dreams about making Blake Shelton a father, she goes back and forth on whether or not to give her three sons another sibling. Theres a multitude of reasons why, a source tells HollywoodLife.

Over the course of Blake Sheltons nearly four-year relationship with Gwen Stefani, 49, the country music star has basically turned into a second father for her three sons. Gwen even admitted that her co-judge on The Voice has been a “good dad” to Kingston, 13, Zuma, 11, and Apollo, 5, while appearing on TODAY on Sept. 23. But the “Hollaback Girl” singer would like her boyfriend to experience fathering his own child as well! “Gwen sees how great Blake is to her kids and dreams about making him a father,” a source close to the couple EXCLUSIVELY tells HollywoodLife. But turning dreams into reality requires the couple to look at logistics.

“It is been back and forth on adding to her family for a multitude of reasons including her age, if they want to adopt and a few other variables,” our source reveals. So, baby No. 4 isnt a guarantee for Gwen, but thats not bad news. “If they dont add to the family she knows that he is so good to her current children and will be an amazing stepfather once they eventually get married,” our insider explains. For now, the singers will continue to debate whether or not its a good idea to welcome a baby. “So she would love to give him his own child and it is a constant conversation between the two,” our source adds.

For now, Blake doesnt need a biological or adopted child to prove that he can tackle fatherhood. Gwen vouched for her boyfriends parenting skills after TODAY host Hoda Kotb asked if Blake would be a good father during Mondays interview. “Hes been helping me out a lot, so I literally get to the point where Im like, You gotta get home, I need help. Its hard. I got three boys,” Gwen told Hoda. The youngest, Apo