Hi findem, I started off just reading the will, but in the end it was easier to just transcribe it. I don't see mention of the brother in law you were hoping for. However it looks as if there are more pages so maybe there is more useful genealogical information. All this page mentions is his sons William and James, and brother John Searle. As I only did this quickly there are a few gaps below.
Alexander
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In the name of God Amen The Sixth day of February in the yeare of our Lord god 1637:
& in the yeare of the Reigne of our Sovraigne Lord Charles 23 by the grace of god Kynge of England
Scotland France & Ireland defender of the Faythe etc the Thirteenth: I Wyllyam Searle of great
Bardfeild in the County of Essex & dioces of London Yeoman, Being sick & weake in body and
Lymbes, But of good mynd & memorye, All Lawde & prayse be given to Allmighty god therefore
doe Make ordayne & declare This to be my Last wyll & Testament contayned in theis words wch are
followinge (Thereby Revoking & disanulling all Former Wylls by me heretofore made) First & princy-
pally I give & bequeath my Soule into the hands of Allmighty God my Maker & Creator & to
Jesus Christe my most mercyfull Redeemer & Assuredly beleyveinge Through his death & passyon
To have Full p[ar]don & Remission of all my Synnes, And my Body to the Earth from whence
it was Taken, To be decently Buryed Att the discretyon of My Executor hereafter named, And
For those Lands & wordly goodes wherewth it hath pleased god of his goodnes to blesse me I
gyve devyse and bequeath Them as followeth Imprimis I give devyse & bequeath and my wyll
my mynde wholely is That my Brother John Searle shall have hould & occupy All that my Messuage & Farme
wherein I dwell Called Ch... by the name of Newemans of otherqyse By what name or names
soever the same is called or knowne by, wth all the Lands meadowes pastures Feedeings woods Spynyes
Commodytyes Lyeinge & Beinge in great Bardfeild aforesayd Att the Park-gate there I have & to
houlde all & singuler The sayd Messuage Farme and presmisses wth all & everye the appurtenances for and
duringe the whole Terme & Tyme of Eleaven yeares To enter uppon the same At the Feast day of
St. Mychall the Archangell wch shall next happen imedyatly after my decease (either he the sayde
John My Brother or his assignes) To theise vses intentts and purposes hereafter expressed and declared
(That is To say) To see my Children educated & brought upp in some honest Lawfull callinge & to p[ro]vyde
For them decently & sufficyently untill they shall attayne unto their sev[er]all ages of one & Twenty years a peece
And To paye & discharge all such debts & Summes of Mony Whatsoever wch I shalle prop[er]ly oweinge and
indebted To any Manner of p[er]son at the day of my deceasse, And my Wyll & Mynd is That my Eldeste
Sonne Wyllyam Searle shall go To service, And That my sayd Brother John or his assignes, shall
allowe & give unto the sayd Wyllm my sonne The Sume of Forty shillings the yeare of Lawfull Englishe
mony to be payd unto him at the halfe yeare twenty shillings at a Time dureinge The sayd Terme of eleaven
years For and Towards his Better mayntenance Item Further I give devyse & bequeath unto my sayd
Brother John Searle The use and Bennyfitt of Those my two tenements sytuate & beinge in the towne
streat of Bardfeild aforesayd nowe in the Tenure & occupation of Daniell Cosse and Katheryne Kepd(?)
Wyddowe or of their assignes To have & to hould to him the sayd John my Brother & his assignes wth all the
p[ro]fytts & commodytes wch may be made of them untyll that James Searle my youngest Sonn shall come
to his full age of one & twenty years, And then I give & bequeath the sayd two Tenemts unto James
my sonn & to his heiers forever Provyded That my wyll and mynd is That my sayd Brother John
shall hould my sayd meassuage wherein I dwell & those two tenemts in the the towne streat wth all the Lands &
commodytyes to them belonginge To him his executors and assigns For & duringe the Terme & tyme
aforesayd not wthstandinge my wyll & mynde is that my sayd Brother John his execurors or assignes
doe mayntayne & keepe my sayd meassuages dwelling house wth all necessary Rep[er]cations & also the other
tenemt when as often as need shall Require And to take but Compen... & needfull Forward on my