The problem with Allform and Burrow is not the fabric.
The cushions will wear out first – in 3 – 5 years (with average use by average size people.)
If your 4 kids like to jump on the sofa, the cushions could wear out in less than 3 years.
Also, the Flexalator seat support system (foundation) has small coil springs holding it to the frame which tend to fall out when kids jump on the furniture.
Before you reject this 127″ x 65″ $1800 IKEA Finnala sectional (with a removable, washable cover) check out my blog article,IKEA Sofas – All the Experts are Wrong!
IKEA Finnala sectional
Leather is not a good investment on a sectional that is going to last 5 years or less.
To get up to a high-quality level for a sectional of this size, you will probably need to pay at least $4000 (in fabric.)