For people with working class backgrounds (like me) family trees can be full of historical and political conflicts. Norman vs saxon, catholic vs protestant , royalist vs parliament, trade vs profession , tory vs whig, christian vs pagan, town vs country, grammar school vs comprehensive , are all found in our tree.
Somebody ought to have reminded me about all this before I started (I'm not very politically-minded).
So any novice (like me) who is about to start please bear these conflicts in mind.