Bruce Jenner's Family All Support His Transition Decision, Says Source
02/01/2015 AT 01:30 PM EST
News of Bruce Jenner's plan to transition to a woman may have come as a shock to some fans, and a source tells PEOPLE that not all of Jenner's children knew about his transition plans until quite recently.
"There was a lot they didn't know about their dad," they said, referencing the younger Jenner children and the Kardashians.
However, the kids (and Jenner's ex-wife, Kris Jenner) are now all in support of the former Olympian's decision.
"The number one thing is they all support Bruce," the source continued. "Kris [Jenner] has been great and anything that says the opposite just isn't true. It's really a hard adjustment for her and a shock but she 100% supports him – the whole family does."
Sources confirmed to PEOPLE on Friday that Jenner, 65, has been preparing to live life as female.
"Bruce is transitioning to a woman," a source close to the family said. "He is finally happy and his family is accepting of what he's doing. He's in such a great space. That's why it's the perfect time to do something like this."
A different insider also confirmed that Jenner is filming his transition for a docu-series that will air this year.
Jenner's step-daughter, Kim Kardashian West, hinted at his personal change during an interview with ET that aired last Monday.
"I think everyone goes through things in life, and I think that story and what Bruce is going through, I think he'll share whenever the time is right," she said at the time.
Earlier this month, West shared a sweet photo of the Kardashian sisters posing on a couch alongside Jenner and his two daughters, Kendall and Kylie Jenner.
"Family first," West captioned the photo.
Reporting by JENNIFER GARCIA