And possible siblings
Ann Pickard born 29/9/1810, baptised 10/3/1811 at Chapel Allerton, parents: William Pickard and Ann Mawson.
Jane Pickard born 3/9/1807, baptised 25/10/1807 at Chapel Allerton, died 15/12/1811, parents: William Pickard and Ann Scarborough.
It is possible Ann Pickard nee Mawson died pre 1811, and William then married Ann Scarborough.
Or maybe not, here's a marriage: William Pickard to Ann Scarborough 31/7/1803 at Calverley, Yorks.
How do you know William (1804) was born in Chapeltown?