Simple cheese cheat to finish it quickly -

[THE VERY REVEREND MISTER BONK]

OK start by going right to the bottom of the map Third grid column from the Left -

Third square up and you will find an old abandoned garage -

Flip the switch on the wall and you get a door to a secret vault with sleep pods -

When in the 1950's world go directly to the Abandoned house and ♥♥♥♥ around with the Garden Gnome, the Bottle and the Radio until you get the correct combination (it's random so keep at it)) -

When the screen appears release the Chinese Army then go to the creepy Chucky girl in the playground and he will let you out -

The father has now been found so go with him to Rivet City (just follow him across the map) -

OK when you arrive this has shaved off more than Two Thirds of the game so you just have to follow the instructions and you can complete it within 1 - 2 hours.

No i'm not going to tell you the ending you get on this play-through. - but - you get a cool giant Gort Robot that's a lot of fun.

[Doggy Friend]

You are wrong about fail safe in Tranquility Lane being random combination.