Bobby Brown is reportedly facing the heartbreaking decision over whether to turn his daughter Bobbi Kristina’s life support machine off.

The R&B singer, who has daughter Bobbi with late singer Whitney Houston, has been by his daughter’s hospital bedside since the weekend, after she was found unresponsive in her bath at home, and later placed in a medically induced coma.

“It’s now a matter of when the family wants to let go and accept that she’s pretty much not going to make it,” a source told FOX411.

They added: “They’ve left it up to the family as to how long they want to keep her alive.”

And according to TMZ, Bobby doesn’t want to face the difficult decision until after the weekend, because he remains hopeful her condition will improve.

It couldn’t come at a more difficult time, as today is Bobby’s birthday, and next week marks the third anniversary of Whitney’s death.

The 21-year-old remains fighting for her life in hospital days after she was discovered face down in water.

It follows reports she had shown a small response to tests on her brain – and family and friends are praying for her to pull through.

Whitney’s friend Kelly Price asked for prayers for Bobbi at a tribute evening to the late singer last night.

Kelly opened the For the Love of R&B: A Tribute to Whitney Houston event in Hollywood by calling for people to send “love and well wishes” to the 21-year-old aspiring actress.

Kelly said: “Bobbi Kristina is in the hospital and her condition is very serious.

“I will say this one thing and this one thing only: Please continue to pray for her as she fights for her life. She is a young woman who deserves a chance to live and to thrive and experience the greatness that is inside of her and come into her own.

“I will ask you all to say a prayer. If prayer is not your thing, send love. Send your love and well wishes to the entire family.”

Later in the show, Kelly and Faith Evans gave an emotional rendition of Heartbreak Hotel, which they originally sang with Whitney, who was found dead in the bathtub of her hotel room in February 2012.

Kelly told the crowd: “Speak well of Whitney Houston. She deserves that from us. Keep her family in your prayers. Keep Bobbi Kristina in your prayers, if anyone can do it god can.”

Kelly – who hasn’t seen Bobbi Kristina for over a year – revealed before the show she had been in contact with the troubled youngster’s family and they welcomed people’s prayers.

[via The Mirror]