Twin sons of different mothers

When Neil, our new head of maintenance, started working here this fall, everyone immediately thought he and looked alike. I didn't see it, though I do admit to noticing that we are both short of stature, have short hair, glasses, similarly shaped faces, and similar builds, and both seem to have generally cheery dispositions. But today, when we coincidentally wore similar sweaters to work, I did finally think, "Wow! We look like we could be brothers!" (That's me, the older "brother," on the left):