The siblings do seem to have had some affection for each other but The Nest brings out the worst in all of them. Whether it's Leo who gets bailed out by it and could repay the money with his slush fund but doesn't, or Jack who has spent the money before he ever received it and then gets desperate to dig himself out, or the sisters who each have their needs, it would have been better for them all to not have The Nest, or at least not to know about it until it was to be distributed. Money causes so many problems - having enough, too much, nothing - and tends to bring out the worst qualities.
Thankfully, my siblings and I have fairly "normal" relationships with each other over time and distance. I am blessed to have my brothers!