Hello MarkyP,
Yes, I would say that the order in the will quite often reveals relationships. I have over 50 wills from about 1450 to 1800 in my research and frequently their testators seem to start by giving bequests to nieces and nephews (usually stating eg "my nephew John, son of my brother William") before going to own grandchildren, then own younger daughters then younger sons ending up at the eldest.
<Benjamin Newland of Adgestone £20
<Thomas Newland, son of Benjamin, 2 Guineas
<Mary, Jane, Anna and William Newland other children of Benjamin Newland, 1 Guinea each>
So this is the Newland family, whom you may know to be related to the Jeroms or not (could be a brother-in-law whose wife, the testator's sister has died?)
<Nephew - William Jerom, £30>
<Nieces - Anne Horlock, Hannah Dove and Elizabeth Grant, £20>
I would guess these to be a brother's children, the three girls, at least, all having married
<Nephews - Thomas and Joseph Jerom, £20>>>
<Nieces - Ann ? and Mary Dove, £20>
These would be the children of another brother (the boys slightly less favoured); one of the girls has perhaps married her cousin Hannah's brother.
<Niece - Jane? 5 shillings>
<Two children of Jane ? by former husband John ? £5 each>
Daughter and grandchildren of another brother or sister (much less favoured, perhaps because of a failed marriage?)
<Niece - Elizabeth Reynolds, £5>
Daughter of a sister who married Mr Reynolds, probably.
<David, son of David ? of the parish of Godshill £5>
??
<Bother-in-law Daniel and his wife Elizabeth ? 1 shilling>
Possibly wife Jane's brother and his wife, or wife Jane's sister (Elizabeth) and her husband Daniel.
HTH though I may be wrong!