'It's Dad!'

''Thank you to American government and Poland government.'' Such thank yous are seldom heard in the same breath, what with the great gulf fixed between freedom and communism. They are worth recording, as in this instance of a Polish father and small son rushing into each other's arms in Boston after a separation of two years.

The boy had been living with his mother in America, suffering so grievously from his father's remaining in Poland that US politicians took up the cause.

It turned out that red tape can be cut - special US immigration status for the father, then a passport from his own government.

And now a Polish version of ''It's Dad!''

Who can't imagine the feeling?