From what I can understand you are sharing an incident in which your father failed to recognise a known face and forgot his way back home.
There could be multiple possibilities (and is usually more than one reason) for this state of confusion and will require review of his current medication, his blood
sugar levels, possible infections, prolonged sleep deprivation.
There is need to assess his signs and symptoms further I would suggest you to seek a consultation. Some work up might also be needed before anything can be said about it.
Next Steps
seek a consultation