How do you merge Grownups.dat and Kids.dat

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Given 2 Data Files:

Grownups.dat:

FIELDNAMES(NameMother;NameFather;NameUncle)ENDRECORD
=========================
AliceENDFIELD
FredENDFIELD
SteveENDFIELD
ENDRECORD
=========================

and

Kids.dat:

FIELDNAMES(NameChild)ENDRECORD
=========================
MaryENDFIELD
ENDRECORD
=========================
JohnnyENDFIELD
ENDRECORD
=========================
EricENDFIELD
ENDRECORD
=========================

How do you code a merge form to generate the document:

"The children of Alice and Fred are:

Mary
Johnny
Eric

Their uncle is Steve."?

Is there a "standard" recommended way to do this?

Are there any web pages which demonstrate this technique?

I couldn't for the life of me figure out a keyword browser search for this problem!