Already did that and there's nobody with that birthplace. That's what made me think that the 1891 I found was the only logical one given the death of Clara and the re-marriage to Sarah Ann.
There is quite a gap in ages between Joseph & Albert which is another give away of a possible re-marriage
If you look at the 1901 entry you listed - Frederick is shown as Frederick W whereas in 1891 he is William Frederick. You can view the 1901 index for free at
www.1901census.nationalarchives.gov.ukThere are a couple of ways of proving whether I am right. A copy of the marriage cert to Sarah will show his status as widower but will not really give you the proof positive that the 1891 is the right entry. The only conclusive way is as follows:
A copy of one of the 1891 children's birth certs will confirm the mothers name and maiden name
Births Dec 1886
Hancox Emma Edith West Bromwich 6b 778
Births Dec 1887
Hancox William Frederick West Bromwich 6b 748
A copy of one of the 1901 childrens birth certs will give mothers name and maiden name
Albert Hancox Dec qtr 1897 Oct-Nov-Dec West Bromwich 6B 848
Edgar Hancox March qtr 1901 West Bromwich Volume: 6b Page: 860
Benjamin Hancox married Clara Jane Allday September qtr 1886
West Bromwich 6B 930