How to make a drop-down list of potential answers from answers in previous questions? (Using XLS)

Goal: In the example below, I would ideally like for the question "Name of
household member 1 involved in weeding" to allow the respondent to pick
from a list of names composed of the names entered in part (a) below.

(Note: currently none of these are not repeat groups, but if it makes
things easier, they could be).

Background:
(a) I have a series of identical questions (name, age, gender) about each
household member, and I assume an upper limit of 20 household members.
(b) Later in my survey, I have a series of questions about household chores
(example of one chore below). Each group of questions pertains to 1 chore.
Once a household says that they did do a certain activity, we want to know
who from the household participated, for how many days and how many hours
per day.

select_one yesno weeding_yn Weeding: Did you do this activity on this
farm?

begin group _6a1 WEEDING - Household Labor 1 text weeding_hh1Name of
household member 1 involved in weeding integer weeding_hh1_days Weeding:
How many days on the farm? integer weeding_hh1_hrs Weeding: How many hours
per day? end group begin group _6a2 WEEDING - Household Labor 2 text
weeding_hh2 Name of household member 2 involved in weeding
integer weeding_hh2_days Weeding: How many days on the farm? integer
weeding_hh2_hrs Weeding: How many hours per day?