88 Heb “drink wine.”
89 Heb “and we will lie down.” The cohortative with vav (ו) conjunctive is subordinated to the preceding cohortative and indicates purpose/result.
90 Or “that we may preserve.” Here the cohortative with vav (ו) conjunctive indicates their ultimate goal.
91 Heb “and we will keep alive from our father descendants.” For a discussion of the cultural background of the daughters’ desire to preserve our family line see F. C. Fensham, “The Obliteration of the Family as Motif in the Near Eastern Literature,” 10 (1969): 191–99.

In other versions

Come, let us make our father drink wine, and we will lie with him, that we may preserve offspring from our father.”

Let’s get our father to drink wine and then sleep with him and preserve our family line through our father.”

Come, let’s get our father to drink wine so that we can sleep with him and preserve our father’s line.”

Come, let’s get him drunk with wine, and then we will have sex with him. That way we will preserve our family line through our father.”

Come, let us give our father wine to drink and let us lie with him that we may secure descendants through our father.”

Come, let us make our father drink wine, and we will lie with him, that we may preserve seed of our father.

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