Paul Walker -- Small Family Funeral ... 'Fast & Furious' Crew Invited

Paul Walker's funeral will be private ... for family only, and in Paul's world his movie's cast and crew is part of the brood.

Sources connected with Paul's family tell TMZ ... their biggest concern is Paul's 15-year-old daughter Meadow, who is understandably having a difficult time. They don't want a bunch of strangers surrounding the girl, because she needs to feel comfortable to grieve.

So the funeral will be by invitation only, and Paul felt the folks on the "Fast & Furious" cast and crew were close relatives. He was with them a lot and bonded with most of them.

The family is also aware ... the cast and crew are grieving just like them, and the funeral will help them cope.

It's unclear when the funeral will take place. Family sources tell TMZ ... sometime after the funeral there will be a larger memorial, but still by invitation only.