Hi trincarl
Welcome to Rootschat

We have a 'no living people' policy here so we can only give you general advice.
If you have the names of the children and their mothers you should check the General Register Office birth index for England & Wales.
It is available online with a subscription through FindMyPast or Ancestry. If you don't have a subscription you should try your local library as many of them offer free access at the library.
The other site to recommend which you can use at home is
www.freebmd.org.uk which is a volunteer project and they haven't transcribed all the data yet. Apart from that the project is only planned at the moment to go up to 1983.
FindMyPast & Ancestry have the details up to 2007.
It might be easier if you are new to these sites to try looking for your own birth registration to see how that was recorded: do you have your fathers surname for example or is your birth recorded under your mothers name? This could have a bearing on how the other children are recorded. You would need their mothers surnames if your fasthers surname was not used when the births were registered.
Other than that there are links here which could be useful
Topic: Tracing Living Relatives
http://www.rootschat.com/forum/index.php/topic,261434.0.htmland
Topic: Searching for living relatives and Rootschat
http://www.rootschat.com/forum/index.php/topic,142443.0.htmlGood luck!
Dawn