Can quotation marks be followed 's?

In academic publication, I must use inverted commas.

"The fact that they had accepted the offer was sufficient to give rise to a binding contract, notwithstanding
the fact that the plaintiffs were mistaken and that they pointed out their mistake to the defendants immediately and before the defendants had acted on it in any way."¹

Presume I must write out "The fact that" like this.

Their having "accepted the offer was sufficient to give rise to a binding contract, notwithstanding
the fact that the plaintiffs were mistaken and that they pointed out their mistake to the defendants immediately and before the defendants had acted on it in any way."¹

Now presume I must quote antecedent of "Their", "[T]he defendants [who] clearly ought to be given leave to defend this action"². Can I write this?

"[T]he defendants [who] clearly ought to be given leave to defend this action"²'s having "accepted the offer was sufficient to give rise to a binding contract, notwithstanding
the fact that the plaintiffs were mistaken and that they pointed out their mistake to the defendants immediately and before the defendants had acted on it in any way."¹

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I start another example, but same question.

"The fact that the pursuers had supplied drivers to operate
the machinery and remove the silt did not demonstrate the existence of a contract on the
defender’s terms."³

Presume I must write out "The fact that" like this.

The pursuers' "having supplied drivers to operate
the machinery and remove the silt did not demonstrate the existence of a contract on the
defender’s terms."³

Now presume I must clarify pursuers, "pursuers [who] offered to supply machinery that could be used to remove silt from the
defender’s pond"⁴. Can I write this?

The "pursuers [who] offered to supply machinery that could be used to remove silt from the
defender’s pond"⁴'s "having supplied drivers to operate
the machinery and remove the silt did not demonstrate the existence of a contract on the
defender’s terms."³

¹McKendrick. Contract Law: Text, Cases, and Materials (2020 9 ed). p 29.
² Op. cit. p 28.
³ Op. cit. p 89.         ⁴ Op. cit. p 88.