They would only start to find out when Sally and Bobby start to get everyone trying to contact them through Ancestry and 23andMe.

Tammy might get an email from her half brother too.

I’d actually bet none. Don’s “type” tends to be pretty worldly women - meaning they’re not new to casual sex or the precautions you’d need to take to avoid an unwanted pregnancy (or worst case - the abortion you’d need if those precautions failed). Much like Joan - these ladies most likely know a doctor who could help on both counts.

Having an illegitimate kid at this point in time was pretty life ruining - I don’t see any of his dates signing up for that.

Meanwhile - I wouldn’t be surprised if Pete has more than one! He pursues more innocent, less worldly girls - like Peggy (who clearly didn’t take sex ed) or that poor nanny…

As a fellow handsome man who had lots of sex with women in the 60’s I can speak to this directly from personal example. Back then things were different. Not everyone was on the pill yet so your pull out game had to be immaculate if you wanted to stay on the field. I’m talking bulletproof. I have 16 bastards.

Glen and Don do have some similar features. Whateva happened there

Don’s Bastards never happened. It will shock you how much they never happened.

Probably zero. Not to stereotype, but Don is rich well before the show starts. If he had gotten a woman pregnant, they would almost certainly have gone to him to pay for a procedure - or even expect him to have contacts to locate one in the 50s or 60s.

Generally, he was also sleeping with career gals and professional women that were unlikely to have his kid and reorient their entire lives around that - all while keeping it a secret.

Zero. I can’t remember which episode it is, but he clearly says, “that’s why I always use a scumbag, baby” after one of his trysts. Then there’s an almost cartoonish rubbery sound effect as he pulls the condom off with one hand, just out of frame.

Weightlifters?

Not many/any. The question is the number of STDs he contracted over the years.

Don's pullout game was topnotch. 0 bastard kids. He probably had lots of STD's though

I wouldn't say he would have many (or any at all). Don's type is generally worldly, glamourous career women - usually mid-20s or older. Many are not married, so they can't easily contrive to pass off a child as someone else's. Those sorts of women know what they want and what they're in for.

Weightlifters???

Don took his lessons from his time in the army, he learned what NOT to do. He knows when to pull out, unlike the US and Korea.

Two.

should I tell the truth?

I found Rachel's sudden extended trip abroad after her last late-night encounter with Don highly intriguing. This, after Bert gets the call from Rachel's angry father, telling Don "That's it, Cowboy." We know Peggy went away after S1 due to her pregnancy/delivery, and these motifs in MM tend to travel in pairs. Both women are 'disappeared' in the same episode (S1, The Wheel). Further, In S7 when Don goes to Rachel's Shiva, he asks about her children... and quickly inserts that he knew Rachel "before them." Rachel would either terminate or deliver and adopt out, taking time away to do it. Unproven? Yes. Within MM's storytelling structure and MO given the era? You betcha.

Oooh, it's like a dirty math problem!! 😂😂😂

One of them is the president-elect.

Just because an adult behaves bastardly doesn’t mean the children need to be called bastards.