Two phrases about fatherhood

William: Hello and welcome to The English We Speak. I'm William Kremer.
Yang Li: And I'm Yang Li.
William: So this Sunday is Father's Day here in the UK and in many countries around the world.
Yang Li: William, I know you are married but you are not a father yet, right?
William: Yes, that's right.
Yang Li: Well in that case, I don't think you are well qualified to talk about this topic, William!
William: Well, I disagree. All that matters is that we can speak English! So today I thought we could look at a couple of very common phrases relating to fatherhood. Let's listen to this clip of a woman talking to her friend about her son. Try and hear a phrase relating to fatherhood.
Woman:And how's Jonathan?
Woman 2:Good question—I'd like to know the answer! He's ever so quiet and I never know what he's thinking ... 
Woman:Oh yeah.
Woman 2:Mind you, his dad's exactly the same. Like father, like son.
Yang Li:Like father, like son. So that means that the son is just like the father, is that right?
William: Exactly, yes.
Yang Li: So, William, can you say 'like mother, like daughter'?
William: Well, you could say that but it's not really a phrase in English. 'Like father, like son' is quite a common phrase. And you have to use those exact words, you can't say 'Like his father, like my son'—it has to be 'like father, like son'.
Yang Li: So are you like your father, William?
William: That's a good question. What do you think, Dad?
William's Dad: Oh, that's a difficult question—
Yang Li:Wow, I didn't know—I didn't realise you were here, Mr Kremer! It's very nice to meet you! Very nice to meet you.
William's Dad: Nice to meet you too. I always like to keep an eye on William, make sure he's being a good son. And I think I was a good son to my father, so in that way, I think he is like me.
Li: I think you look quite alike, except that William is much taller than you—he is a giant!
William's Dad: I have to carry a chair with me wherever I go just to keep up with him!
William: Alright, Dad. So, before we finish today, let's have a look at another phrase connected with fatherhood. And this phrase means a long time before you were born. In this clip a woman is talking to her uncle. Try and hear the phrase.
Woman:I didn't know you used to have a motorbike!
Man:Oh yes. I had one for a couple of years ... it must have been in the sixties; before you were even a twinkle in your father's eye!
Yang Li: Wow that was quite a long phrase—'Before you were even a twinkle in your father's eye.'
William:Yeah, or you could say, 'You weren't even a twinkle in your father's eye'. A twinkle is something that shines brightly, like a star. So it's quite a romantic word. Maybe the phrase means: before your father ever looked at your mother in a romantic way; so, long before you were born.
Yang Li: Well, we hope that these English phrases might be useful to you this Sunday. Happy Father's Day!
William: Happy Father's Day!
William's Dad:Oh thanks guys!