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Well yes, but it was never flat-out stated that it was his son. So until we get official confirmation that it is, it technically would be speculation.

Oh and by the way, if I remember correctly, the Deku Butler tells you about his son after you do the race for the Mask of Scents. It's only speculation that the Deku he was staring at in the credits was his son.

It was when he fell through that hole he entered Termina. Notice the symbols and stuff as he was falling down. But I think the dimensions split when he entered the Clock Tower.

That was actually the Deku Butler, and that was his son he was staring at. He was cursed by Skull Kid, while wearing Majora's Mask.