
Gone are the days when GSDs were(in the UK) supposed to be "wary of strangers" because if the poor examples if the breed that were shown in the 1940s/1950s, that it was made part of the breed standard. Along came some good quality German GSDs , outgoing & steady temperaments & the breed is now no longer nervous & fearful, except for those bred by "Alsatian"type fans
Golden Retrievers & Labrador Retrievers can be very full on as a youngsters & do need lots training & consistency. Labradors are NOT easy to train
I would never advise buying a crossbreed of any two breeds, the puppies are very much a lottery.
Perhaps a trip to "Discover Dogs" at Crufts would give them an opportunity to have hands on experience of the very varied breeds they like.
Don't quite understand anyone suggesting Bernese Mountain Dogs or Boxers as an alternative to those the couple like, they are like chalk & cheese.
I see you have dogs two dogs as your avatar are they yours ?