- Parents: Alex Muhlach and Rebecca Rocha
- His second child with Edith Millare was stillborn (it was only five months).
- Had a son with (Edith Millare) named Alessandro Martinno (2003).
- Owner of the D'Wonder Films which produced most of his films in the 70s and 80s.
- First cousin of actor Aga Muhlach.
- He was dabbed as the Child Wonder of Philippine Cinema in the 80's for making films which gained both critical and commercial successes opposite famous movie stars such as Vilma Santos, Dolphy, and the King of Philippine Cinema (later became Muhlach's godfather), the late Fernando Poe Jr..
- He still holds the title for being the highest-paid child actor in the history of Philippine Cinema.
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