If you don't know who Yasodhara and Siddhattha are: Siddhattha Gotama, that's the Buddha, and Yasodhara was his wife. I want to give you a little background before I get into this, because it's helpful. As far as Buddhism and rebirth goes, it's basically said that Yasodhara and Siddhattha, our Buddha, had been married in past lives 500 or more times. That's how closely connected they were. When the Buddha was 19 and his father thought that he should get married to keep the family line continuing, it is recorded, the Buddha was not interested at all,. But the King wanted to make sure that he would fall in love. So the King devised a plan in which he would have Siddhattha give a present to every young single woman in the whole kingdom. That was a lot of gifts for all the women. And they were all necklaces.
So all the women came to a big ceremony. They lined up and Siddhattha gave them each a necklace.
On the sideline though, the King had said to his best advisors, "Watch Siddhartha's face, and you tell me if there's any change in his attitude.
The King felt that there would be one woman whom Siddhattha would treat differently. So they watched. As the story goes, every woman came through, Siddhattha would take a necklace and put it around her neck, wish her well, and fine, they all passed through. Now, maybe it's ironic but Yasodhara is a name that starts with Y, so for many of us it comes at the end of the line. So she did, she was the last woman in the line. As it turns out, she came up, the Buddha sees her, looks for necklaces and they're all gone, they were one short. He looks at her again, he takes off his diamond studded belt and puts it around her. Cute? The advisors of the King thought without doubt, "That's her!" OK, Talk about destiny!
This is because Buddhism teaches rebirth. Buddhism says they were married in many, many past lives. And when people are this closely Kammically connected , they think almost on the same wavelength.
Now, going back to Yasodhara and the Siddhattha when he went off to practice, to discover enlightenment, his whole intention was that after he understood, he would come back and teach his wife, his son, his father, stepmother and everyone else. And because they were on the same wavelength, it was said that as soon as Yasodhara found out the Buddha had left the palace, the next day, she shaved her head and went and meditated in a room and someone else took care of their son. So she was doing exactly the same thing as he was doing, on her own, practicing meditation, trying to discover truth also. Limited though because she had to stay in the palace, the Buddha could go and find teachers and such. Yet because they were on the same wavelength, that's exactly what she did.
Now to go further with her story is helpful. Six years later when the Buddha was fully enlightened and came back to teach, he certainly taught her and everyone else and she became, I believe, very quickly, a stream-enterer, first-level enlightened. Later she became a nun and she became fully enlightened. According to the scriptures, she was the greatest woman Arahant, enlightened person, for super psychic powers. She was the greatest, number one on that level. So she ended up being a gifted teacher on her own.
There isn't much in the scriptures about her, just the little I just mentioned. There's also not much mention of the Buddha's son, only four little stories. The reason the commentaries give as to why they're not talked about much, is that they wanted to make certain that the religion was not established as something that a family controlled, father to son and so on, like kingdoms. But as far as what is written, she became a great enlightened person and her life was in line with the Buddha's.