Hello Benzol
Not my family I am sorry to say. Alfred was the son of Samuel and Susan Chappell (1801-1876), and Samuel was the son of George (1753-1818) and Susannah (1763-1829). I did find a William Odell in 1901 who could have been the one who was a patient in 1891, except that he was an Attendant at the Herts Lunatic Asylum, St. Albans.
I live in Hertford so have visited County Hall quite a few times over the last six years and, unfortunately, there is no marriage between a Daniel Odell and Rebecca in the Allen Index. My hope is that the Essex one might be correct because there was a William Odell in Bengeo who was born in Littlebury, Essex, in about 1807. His wife and my Daniel's wife were sisters. Unfortunately, William died in 1859.
Regards
Delta