George Frederick's youngest child was Henry Grow often called Henry Sr. who was born in July 1768 and lived out his life near the old family home. He was the Proprietor of the Flat Rock Tavern in Lower Marion Pennsylvania. Joseph Price and his Diary 1788-1810: August 4th 1809 Wind S W. & afine warm day at work in Shop till noon for Meeting then off to Doct Hydricks meet Owen & Jonathan Jones, on to see the flat Rock where they are gooing to Build a bridge tremendous Rude place Henry Grow has Built a very deacant 2 Story house intended for a tavern, Stranges[t] things Come to pass in this Age, for this is one of the most remout & out of the way places almost in this Country, the Randivues for foxes not a trace of Human Art, nay not a Spot for a garden near or at it Tremendous Rocks and my Idea is it Cannot take any Concourse of People, on to Hagys Drank Coffee & had a delitious Dish of fryd Catfish & A Chearfull Glass Brandy & wine a very Generous Noble Man at home & abroad but Strong Passion & the vulgar often insult him which He Cant Brook well He would Been happy from his we[a]lth before the Revolution But Such a nothen [notion] of Equallity in this Age hurts the feelings of the appolant [affluent], for welth dose [does] not give that Conciquence in this Country [in margin: "Sowd turnips the 3rd"]

Henry operated the Flat Rock Hotel until his death in 1826. It was then run by his daughter Catherine and her husband Joseph Smith, and later with her son William Smith.

Henry Sr. and his wife, Mary Riter, had seven children.