Slight disclaimer but I have come across some typos in this print of Yotsuba,
the manga that this sentence is from. The sentence in question is

> おージャンボにもとーちゃんいたのか!

The following sentence is

> よつばにもいるよ?

so に's use is the same. I've understood に to be the target particle and も is
the inclusion particle. I believe them to be separate in this case and to my
knowledge, there is no にも particle. The english translation for the first
sentence is "Oh! Jumbo has a daddy too!?" I was wondering what に does here
instead of the sentence being something like

> ジャンボはとーちゃんもいる。

That also brings me to a side question. In the first sentence, いた was used and
the English translation given was as stated before, "Oh! Jumbo has a daddy
too!?". Why is いる past tense here? Is the English translation off or perhaps
the Japanese? ジャンボ 's dad is alive. I didn't think that warranted a second
post, but i'd mainly like to know why に is used here. The closest reason I
could think of would be that it is the "target of having" although that still
doesn't make sense to me when I think you could just use the non logical
particle は。

Thanks for any help that comes my way. It's greatly appreciated.
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question
particle-に
How is に being used in おージャンボにもとーちゃんいたのか?
> おージャンボにもとーちゃんいたのか！

This sentence is natural and makes perfect sense. This に is a "location"
marker used with いる/ある/ない/etc, although it refers to some abstract "location".
You have to get used to this pattern because a verb similar to "to have" is
rarely used in Japanese. See: [Cases where "に" cannot mean
"at"](https://japanese.stackexchange.com/q/42803/5010) and [What is the
difference between ni and ni wa, when talking about a
person?](https://japanese.stackexchange.com/q/43887/5010)

  * 私には夢があります。  
I have a dream. (literally "There is a dream in me.")

  * 彼女には子供が2人います。  
She has two children.

  * 彼には才能があります。  
He has a talent.

As for this past tense, it is something called discovery-ta or modal-ta. See:
[Non conventional usage of the past
tense](https://japanese.stackexchange.com/q/40733/5010)
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answer