I was thinking much the same. It’s like Stacey thinks she can be a bit lax because she knows he has so much more when he goes to be his other family.
I doubt she would ever admit to it and I’m not sure if all the time it’s conscious, but is it a coincidence that Leighton seems to be treated least favourably to his siblings when we know there seems to be a great family dynamic with his dad and step mum including a lovely relationship with his first little sister* and whilst money and material things aren’t everything, holidays to Disney World and designer clothes are evidence of a good standard of living.
I think it is galling to Stacey, in fact I think the whole blended family thing altogether doesn’t sit well with her at all and to top this the relationship Leighton has with his stepmother seems to be in stark contrast from what we know of Stacey’s relationship with Harry. Whilst I’m not saying it’s easy, situations like this seldom are, she’s the adult here and you would hope she’s at least making an effort.
I guess on the plus side Leighton does have this other outlet and maybe at some point it will become more permanent.
I just hope until then the disparity in treatment isn’t as obvious to him in real life as it is to us onlookers and is shown on social media.
*If you listen very carefully hear you’ll be able to tell when Stacey reads this as there’ll be an almighty shriek from Pickle Cottage… like a red rag to a bull!