Our expert says:
OK, this man is a bad father, apparently at least a verbally abusive one, and possibly physicall as well, but you don't know that.
Any chance of getting to know the gran, and chating to her, discovering what she has noticed, and how she feels about the situation ?
Swearing at him obviously wouldn't help, would it ? Not onlywould it not convince him to change his bad behaviours, but it'd suggest to the kids that this is how adults are supposed to behave.
If you know anyone at the school, maybe you could chat to them, but if you don't, they should probably not agree to talk about a child whi isn't yours. Lou's idea of an anonymous letter to the school might work, or approaching Child Welfare about your concerns, so they could decide whether to investigate.
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