This is the container.
The fertilizer is Jobe's Organic vegetable & tomato

Thanks again

First they need separate containers. The Parks Whopper alone will eventually take over that lone barrel. That is a good size for 1 plant, not 2 or 3.

Then, if we assume your Dad's variety is an open-pollinated one (non-hybrid) and since the PW and the Bonnie's Original are both hybrids, yes you may get some cross-pollination.

Move Dad's plant away from the other two as much as possible and read the FAQ here on how to prevent cross-pollination by bagging some of its blooms to keep the seeds true.

Of course if Dad's is also a hybrid then it is a moot question anyway.

Dave

Here is a link that might be useful: FAQ on preventing crossing

Will I get a different tomato from the seeds that are produced from the fruit due to cross pollination?

If you're asking whether the plant grown from Dad's 2012 tomato will yield tomatoes just like that one: It depends whether Dad's plant was hybrid or open-pollinated. Do you know the variety name?

But if Dad's tomato was an open-pollinated variety and that particular fruit had been cross-pollinated with pollen from another variety on his farm, the tomatoes you get this summer might be quite different from the fruit you ate last year.

In any case, cross-pollination only affects the plants grown from the seeds of the fruit. So the fruit you'll get from Dad's plant this summer will all be true to the genes in that plant, regardless whether those flowers are pollinated with pollen from that plant or cross-pollinated with pollen from your Bonnie Original or Improved Park's Whopper or a neighbor's tomato. However, when you're talking about plants grown next year from the seeds of your 2013 fruit, it depends on whether those particular flowers are cross-pollinated.