It would be possible to use {moi} for this, you're right, since it admits a place to give the ordering criterion, which is presumably a unary predicate used to sort the elements in ascending order. (My choice here is somewhat arbitrary since nobody has actually decided what we should put for these ordering criteria.) If the criterion is left out, as it is in {lo patfu vomoi}, then it is left up to context, and if we're talking about ancestors, it might make sense to refer to a gggreat grandfather. On the other hand, if we're talking about parents remarrying or nontraditional family setups, then it could easily refer to something else. (That's the principle of "facultative precision"; since we're saying less things, we're not as precise in the interpretation. Of course, the syntax is always totally unambiguous.) Anyway, writing out a suitable ranking predicate might be challenging; I leave it as an exercise for you :) Just know that {moi} could be used for this, but doing so with precision may require more verbosity than the other solutions mentioned in this thread.
.i mi'e la tsani mu'o
P.S. if you want to come on IRC sometime, we can build that ranking predicate together if you like. I'm tsani there as well.
Would something as simple as "4th father" be nice and concise --not sure how to say that though.--
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