I had a holiday to Oxford and visited the record office this week, and only after returning home did I realise I left some new paths untraced .....

I was trying, in fact, to find the ancestors and siblings of a Samuel Alder, victualler and drill sergeant in the oxford yeomanry, who died 1822 aged 55, in st Peter le Bailey, Oxford. (I only found all this out about him his week!!). We found his will showing he left a lot of money and property to his family - 9 messauges and a mortgage for land and property worth £500. But we didn't think to trace a John Alder who witnessed the will!!!
From what I can gather from afar online, there was a gent nearby called John Alder. There was also a Benjamin Alder, also a victualler, nearby, and a spinster Sophia Alder and her married sister Hannah Wyatt. Benjamin and Sophia also left a lot of money in their wills (£800 and £450). I can't access what John left in his will from home online.
And today I found a John Alder, 1767 lottery winner in Abingdon who quickly changed from being a cooper to a gent!! He died in 1780. Could this be their father or grandfather? Are they all related anyway? Where could they have got their money from if they weren't related? (I can't find a birth for Samuel. His wife came from Devon and their eldest child was born in Bath. Their other children were born in Oxford).
If anyone can offer any assistance with any of this, I would be immensely grateful as I'm unlikely to be able to visit the records office again for years!!