From the kids ages in 1891, either they married 1882 ish, or William brought kids with him from a previous marriage.
Ada and 'Lottie' are the link to 1901 ...
Now that looks like them yes

The name Hayward is always bugging me as that was my maiden name for 27 years so I know how annoying it is spelled Hayward but it is Haywood. Everything else seems to fit okish. I know there is certainly an Ada and Lottie from living relatives. Also I have found them on the 1901 census listed correctly. William was born in Orton though in Leceistershire not Heston as listed in the 1891 census. Do you think that is still ok?
Gertrude seems to have vansihed bewteen the two census as well but as she was 9 in 1891 she may have married before the 1901 census came about. The others on the 1901 were all under 10 when the 1901 census came out.
It certainly looks like them
