Josh fixed pancakes for dinner the night Susan disappeared.
No reports of Susan feeling ill earlier that day; only after she ate dinner. I have not seen any reports of friends or family which indicate that Josh was especially helpful around the house...especially not with traditional "women's work", such as cooking. From what I've read and heard about their marriage, Josh is a very controlling, angry, difficult person to live with. Just the fact that Susan had to walk to church that Sunday morning when the winter weather was so bad, even though they have a van and Josh stayed home, is a big indicator of a husband who was comfortable doing anything he could to make his wife's life more miserable...not the kind of Hubby who would serve his wife dinner without an ulterior motive!
I'll see you (bbm) and raise you one more. I highly suspect SP assisted in the damage control after the fact (from instructing his son re clean-up and cover-up including advice re staying below LE's radar, and quite possibly even in transporting and disposal) thus IMO almost surely an accessory AFTER the fact... but I've even gone as far as to question how sinister a role he may have subtly played in the inception of this plot... call me crazy, but SP isn't someone I envision encouraging JP, "Take the high road, son... be fair to your wife, and work together as much as possible for the sake of the boys, and let the courts handle anything else." 
