Albert Barnes Commentary Jeremiah 35:8-10

"And we have obeyed the voice of Jonadab the son of Rechab, our father, in all that he charged us, to drink no wine all our days, we, our wives, our sons, or our daughters; nor to build houses for us to dwell in; neither have we vineyard, nor field, nor seed: but we have dwelt in tents, and have obeyed, and done according to all that Jonadab our father commanded us." — Jeremiah 35:8-10 (ASV)

Our father - Not merely our ancestor, but the founder of our institutions.