Sharon,
It looks as though you have got the tree shaped.
What you don't know for sure you have guessed.
You are right that Margaret may have married Alexander M
Buck, Annie >John B
Adams and Gertude >Charles
Cole.
But as you probably realise you cant build a tree on guesses and may-be.
But for modern stuff ( e.g. later than 1911 census, last one available) it is more difficult- working on FreeBMD only, and that's only an abbreviated index.
To be sure you will either have to buy copy certificates or seek out church records which more or less provide similar bits of info.
Margaret may have had children with John
Adams, that may be still alive today.. so I have to be careful not to mention them.
By the way did Robert marry before he went to war ?
Michael
Dixon