I kinda get what you're saying. My DS1 is 6 in year 1. When he went back to school in Sept they were set a 2 week research topic on "Your family tree and roots" Well the minimum that was expected of them was a family tree and a few paragraphs about where you and your family are from.
Trying to get my 6 yo son who is not a fluent reader, who doesn't have a very long attention span and who is still learning to write and spell to actually sit down with me and go through our family tree and explain what it was and our family history was not an easy task.
I have got quite a lot of old family photos on the computer and we do have a large family so I got him involved as much as possible, showing him photos and telling him who they were and who they were to him, as in uncle, great great nan etc. We then had a talk about our family and where we come from, explaining that some of our family live in Ireland, some in Canada, some in Australia and some in England. When it came to presenting the work he chose the photos off the computer that he wanted to use but I did all the rest of the work, organising it, typing it up, explaining about family history, we hand write the family tree, it only went back 5 generations but took up 4 pieces of A4 paper, I got my DS1 to write a few of the names and dates of birth, but tbh it was too much for him and I ended up doing 95% of it. I really felt that the homework was way too much to expect of a 6 yo, it took hours and I have 2 other children to see to as well.
To top it all of he handed it in to his teacher and said "there's my homework Mrs X, It's my family tree, I think the real ones is planted in Ireland Land theres' lots of old photos of people, I don't know who they are, oh and I'm a bit Canadaish"!!