As per the question, I think the answer is $2\times4! = 48$ ways, but unable to visualize how they are seated in?
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There are six seats: $1-2-3-4-5-6$.
Let's call Mr. Spencer $S$, his two children are $C_1$ and $C_2$.
There are $8$ cases:
$$C_1-S-C_2-...-...-...$$
$$C_2-S-C_1-...-...-...$$
$$...-C_1-S-C_2-...-...$$
$$...-C_2-S-C_1-...-...$$
$$...-...-C_1-S-C_2-...$$
$$...-...-C_2-S-C_1-...$$
$$...-...-...-C_1-S-C_2$$
$$...-...-...-C_2-S-C_1$$
For each case, the other $3$ people sit randomly (anywhere is fine), so there are $3!=6$ possible ways for each case.
There are $8\times 3!=48$ ways overall, so your guess is correct.
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