I have never heard such a thing before you have said it. For your information my friend met both Jeremy and Sheila together when they were out with the young farmers. He said that they both appeared to get on together very well. In any case there was a long time between Sunday and Tuesday.
I don't know how old they were at the time your friend supposedly met them but her husband had a great number of things to say in these regards that were contemporaneous to the murders.
He seems to confirm a number of points of the family concerning Sheila having coordination problems, issues between Jeremy and Sheila (Julie said they didn't get along because he had no patience or something along those lines I would have to go read her statements again she said she got along better than him with Sheila)
He is also the one who said that she had a better relationship with June as of late, particularly bonding over religion. He also mentioned tidbits about how she loved the twins but didn't really do much with them she seemed to be like those parents who let their kids go play and spend all day doing their own thing. This is the kind of thing which tends to support the doctor's assessment she would have welcomed part time foster care.
He mentioned that of the adults Nevill usually went to bed the earliest, then June and that Sheil ahad no set time she would go early or late but as of late she had been tired a lot and going to bed early.
The farm secretary didn't like the extended family much it seems but still is the one who said that Nevill was convinced Jeremy wanted him dead. That is interesting because she seemed to think they were stealing from the estate so had no reason to want to help them. So this is another thing that strikes me as credible. Telling Ann Eaton he would soon be her partner in the Caravan site and his talk about the Caravan profits supporting him getting a Porsche also are very interesting.
In isolation these things are simply interesting but when looked at in combination with everything they take on some significance and cast things in quite a different light.