I suppose, North Wales being the heartland of Welsh speaking, there wasn’t the same sense of a language under threat. My family always spoke Welsh and were proud of it (on the rare occasions they ever gave it a thought, since it was second nature to them), and I don’t ever recall any discussions about anyone discouraging them to speak it. I do however recall my grandmother being adamant that if you wanted to get on the world you need to be bilingual. So for that reason, in the 1930s, she encouraged her children to learn English thoroughly, in the way you would encourage a child to get a good degree or pass their driving test. Because it will help them in life.
Interestingly I was on the island of Inishturk, off the west coast of Ireland, a few years ago. Population is less than 100, and none speaks Irish these days (though there are Irish speakers not too far away). When I asked about it, they said that they had known for generations that there would be no employment on their small island for their children and they’d have to go off to New York or Dublin to get jobs, and that they would have a hard time and hardly anyone would employ them if they only spoke Irish. So they had always encouraged learning English, to the point that Irish had died out. Sad but perhaps a facet of the modern world. Feeding yourself and your family becomes more important than your heritage.