siblings

I recently read a post on facebook about siblings in adoption.  One person (whose aunt placed a child for adoption) said that biology doesn't matter.  That child is not a part of her family.  She is not a cousin or a sibling or a child.  That she can not push her way into the lives of the other family members. 

Biology?  Siblings? 

I lost 5 of my 6 biological siblings when I was adopted.  I was adopted with one siblings.  I have since found all of them -- and lost some again.  Is there importance in the sibling relationship in the adoption world?

My siblings (not adopted with):
T - technically a half sister (different father). Smart but did not use her potential.  Or is that a judgment?  She lost 2 of her 3 children to the foster care system.  She never held a job.  She dated men in jail.  She mooched.  She begged for money.  She lied.  She spent some time in jail for stealing social security checks from an old lady.  I cut her off.

C - I found her.  I pissed her off.  She cut me off.  She went to college.  She study working with people with disabilities.  She ended up having a child with severe disabilities.  She married an abusive ass (yeah, another judgment). 

J - I found him.  He has disabilities but I am unclear to what extent.  He disowned his adoptive family at 18.  Now 18 years later he is trying to re-establish that relationship.  This year he has been arrested twice (that I know of) for theft by writing bad checks.  He stole his best friend's wife (right after he divorce his best friend's mother).

P - I  found him.  Successful business man.  Musician (fairly successful).  Husband.  Father of 3.  Conservative.

J2 - I found him.  Single.  Devoted to his family.  Chef. 

Sibling (I was adopted with):
A: Educator.  Single mother - while completely different in style than me, a good mother.  Religious.  Former military.  Fairly conservative.  Big spender (more so than an educator can afford).  Gullible.  Optimistic.  Not really interested in hearing about alternatives to her own thoughts.

Me: Social worker.  Paralegal.  Single mother.  Strict.  Liberal.  Atheist.  Pessimist.  Stubborn.  Known as the oppositional employee at the office.  Opinionated -- and often wrong.

We all seem to have very little in common.  I regret none of my decisions to search for them (even the ones that I no longer talk to).  My lost siblings are my biggest regret with my adoption.  I believe when it comes to siblings, biology does matter.  I wish my daughter had siblings -- although she swears she has them. 

Thoughts?  Does your child have biological siblings?  How do you handle that?  What would you do if your child wanted contact?  If they were minors?

Mean Mama