Sweets (group) Puns

So my dad is usually really quiet and "submissive" right? Like he doesn't do a lot of loud things except find the distance the chicken had to travel to cross the road in a bad dad joke.

Anyway, whenever one of us(a 6 people family) comments about something in a small group of 1-3 people, he's always got all the information. He just... knows. For example(this happened like 10 minutes ago): Me: "Wow, this tea is pretty sweet today." Mom: "well, did you sweeten it?" Me: "I d-" My dad shakes his head. Dad: "No, the person who made the tea added double the amount of sugar you previously added to the jug." Mom: "Who?" And then he points to the bedroom before I can tell my mom who made my glass of tea.