Conversation so far:
What did David Thompson (explorer) do during his later years?
David Thompson retired with a generous pension from the North West Company.
Did David Thompson (explorer) have any other achievements?
David Thompson's 1814 map, his greatest achievement, was so accurate that 100 years later it was still the basis for many of the maps issued by the Canadian government.
What else is notable about David Thompson (explorer) in his later years?
David Thompson never finished the book of his 28 years in the fur trade, based on his 77 field notebooks, before he died.
Was David Thompson (explorer) work published?
In the 1890s geologist J.B. Tyrrell resurrected Thompson's notes and in 1916 published them as David Thompson's Narrative, as part of the General Series of the Champlain Society.
Did David Thompson (explorer) receive any recognitions or awards?
A federal plaque reflecting that status is located at Jasper National Park, Alberta. Meantime, David Thompson's achievements are central reasons for other national historic designations.
What else is significant about David Thompson (explorer) during the end of his life?
David Thompson's body was interred in Montreal's Mount Royal Cemetery in an unmarked grave.
What happened after David Thompson was buried?
It was not until 1926 that efforts by J.B. Tyrrell and the Canadian Historical Society resulted in the placing of a tombstone to mark David Thompson's grave.
Did David Thompson (explorer) get out of debt?
David Thompson was forced to take up a position as a surveyor for the British American Land Company to provide for his family.
Where did David Thompson (explorer) live?
David Thompson's luck continued to worsen and he was forced to move in with his daughter and son-in-law in 1845.

Question: how long did he live there?
Self-contained rewrite: how long did David Thompson (explorer) live with his daughter and son-in-law?