The father of JAMIE-LYNN SPEARS' unborn child has been welcomed into the SPEARS family fold - despite his responsibility for their daughter's shock pregnancy.

The 16-year-old sister of Britney confirmed she is 12 weeks pregnant with student Casey Aldridge's baby during an interview with OK! magazine, which hit American newstands on Tuesday (18Dec07).

And while her father, Jamie, is allegedly furious at the way she chose to break the big news, he and mum Lynne are apparently huge fans of her choice of partner.

A source tells People.com, "Jamie talks about how he really likes Casey because he's a great guy. Lynne really likes him, too. He's a good kid, cares a lot about Jamie Lynn. They both adore Casey."

And the source adds the general feeling is that he will take responsibility for his actions, adding, "He's a stand-up guy, and he will take care of the baby. He is not the type to let her deal with it on her own. He will be there in any way he can. ...I know a baby wasn't in his plans for right now, but he'll do what he has to do, and he'll be a good father. He really will."

Spears allegedly dumped Aldridge this summer (07).

Jamie-Lynn has told OK! magazine she intends to keep the baby, which is reportedly due in June (08).