One Direction singer and expecting father Louis Tomlinson is having a tough time with his own father Troy Austin. Austin and Tomlinson have not talked in three years, but the estranged father is determined to be back in his son's life after news broke that Tomlinson is going to soon be a dad himself.

According to family friends, Austin is ready to drop a bombshell about his son in attempt to get in contact with the singer.

"Troy has always wanted to repair that relationship - but if Louis isn't prepared to do so, he's told a few friends he has something which would really throw a grenade into things," a source tells the Mirror. "He sees it as his final shot at getting Louis' attention, and he's said he will drop the bombshell it if he feels it's the only option he's got left, even though it would come as a massive shock."

Now Tomlinson's step-father Mark Tomlinson is getting involved. Mark helped raised Louis since he was 5 years old and defended his step-son on Twitter, writing, "Blackmail????????? Stupid man. Got a good mind to pay you a visit!!!!" Mark and Louis' mother are no longer together, but the singer still considers him to be his real father. Louis' biological father wants to heal the rift between the two and be able to be in his grandchild's life.

Last month news broke that Louis is expecting a baby with his friend, Los Angeles-based stylist Briana Jungwirth. Jungwirth is said to be about 13 weeks pregnant with their child, according to the Daily Mail