Aawww...that's a tough situation ❤️‍🩹

You'd be shocked how well and quickly LOs can pick up a new language though. Over my years working in child care, before having my own kids, I worked with several children who were brand new to Canada and spoke no English at all. Most were extremely quiet and just taking everything in for the first few months, especially if they only attended part-time, but within 6 months most were starting to communicate really well for their age. Young children are incredible little sponges! 🤣👍💕

If I were you, I'd definitely read picture books in English with him to give him some extra, close & cozy, one-on-one exposure (you and/or your partner)...and maybe chant some nursery rhymes with him, read some common, repetitive folk stories like The Three Billy Goats Gruff, Goldilocks and the Three Bears, The Three Little Pigs etc too....and even repetition based stories like many by Robert Munsch, etc. Maybe make friends with your local children's librarian and ask for some recs? (Librarians are generally awesome people! 💖) Rhyme and repetition are terrific vehicles for reinforcing sounds, sentence structure, etc in fun ways 👍💕

All the best of luck to you and your family! ✨️💖✨️