Sarah,
The Harrisons definitely appear in that order with those ages.
One thing I have noticed is someone appears to gone over the adult ages to round them down to the nearest 5 or 10. The first Fanny's age reads as 28 but the 8 has been written over with a 5. The 0 of the 30 of the second Fanny looks as if it might have been witten over a 4. I wonder if she was a child and her age was given as 4, amended to 3 and when the rounding was done misread as 34 and rounded to 30. A bit convoluted I know but if that fits better with the members of the family you know of it may be the answer.
Frances Marshall was a lady by the way - her age looks as if it may have been written as 27 originally.
From the previous pages I'm pretty sure Hana Road is an abbreviation for Hanworth Road.
Phew - I hope that all makes sense

Much as we love the info we can get from the census - 1841 could definitely be more user friendly.
All the best,
Pinetree