Theseus was well aware what all this felt like. He'd gone through this when his dad had gotten cancer and he'd been in and out of the hospital. He knew what Jamie might need and he hardly minded offering company. It was the least he could do.
And he did enjoy meeting Jamie's family. Being an only child didn't make for much family until recently and he could see all these people obviously cared for Jamie. Knowing how a big portion of his family refused to accept him for who he was, it was nice to see.
When he noticed the woman he rose and smiled, letting her greet Jamie first.