He married Elizabeth Kohler at St James, Piccadilly in 1801.
Records at the same church show a daughter christened in 1803 and buried in 1804, the burial of a John Kohler in April 1805 and a son John Augustus (Grimwade p.573) christened in September 1805.
KOHLER, John I (Grimwade p.573)
Moderators: buckler, MCB, silverly
Re: KOHLER, John I (Grimwade p.573)
The Will of John Kohler, musical instrument maker late of St James’s Street, was proved for probate on 5th April 1805 (National Archives reference PROB 11/1424/50).