Last week batsman Jamie Dalrymple, director of cricket Matthew Maynard and president Peter Walker all resigned.
Robert Dalrymple, 44, formerly of Gretna, was sentenced to nearly seven years in prison in 2011.
Justin Langer then skied a catch to Jamie Dalrymple at mid-wicket, before Trego took centre stage.
Dalrymple was one of two fishermen who plucked Elian Gonzalez from the water last November.
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Glamorgan were 221-4 at stumps, just 48 ahead, with Dalrymple on 52 not out.
Dalrymple's century, from 174 balls with 13 fours, was his fifth for the Welsh side.
"I'm desperate to play, " said Dalrymple, who could also supply useful runs at number eight.
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Russell had said he hoped that both Dalrymple and Maynard would remain at Glamorgan.
BBC: Matthew Maynard resigns because of 'untenable' position
Gov Dalrymple added the state should put money aside to pay for legal challenges to the laws.
North Dakota's fetal heartbeat law was one of three laws targeting abortion that Dalrymple signed on Tuesday.
And although Kaneria removed Wallace, Adam Shantry and Garnett Kruger, Dalrymple was still there at the close.
The suit was filed Monday in federal court in Miami by Judicial Watch on behalf of Dalrymple.
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Last week batsman Jamie Dalrymple, director of cricket Matthew Maynard and president Peter Walker quit the club.
Glamorgan chairman Paul Russell and Petersen insisted that Maynard and Dalrymple had futures at the Welsh county.
BBC: Matthew Maynard resigns because of 'untenable' position
Dalrymple is a former Oxford University captain and led Glamorgan twice in the County Championship in the summer.
Glamorgan were well placed to challenge that total at stumps, closing on 257-3, with Dalrymple out for 58.
This is the latest in a short saga beginning in November when Glamorgan replaced Jamie Dalrymple as captain.
On Tuesday, the county announced a new captain Alviro Petersen had been appointed, unseating Jamie Dalrymple as skipper.
BBC: Matthew Maynard resigns because of 'untenable' position
"The final table does not represent the effort and performances of the boys here have put in, " said Dalrymple.
Former captain Jamie Dalrymple and president Peter Walker also quit the Welsh club.
Jamie Dalrymple then led the way for Glamorgan with an unbeaten 89 as the home side closed on 279-9.
Skipper Jamie Dalrymple (50) top scored for the home side at Sophia Gardens with 50 out of Glamorgan's 129-8.
Dalrymple went after being informed that South Africa opener Alviro Petersen had been asked to lead the team next season.
Dalrymple, who went to 50 off 114 balls, then shared the day's main partnership of 71 with Mark Wallace (48).
Dalrymple Bay, which is fed by state-owned railways, may be congested, but Port Hedland, in western Australia, certainly is not.
In a BBC interview, Petersen said he had not spoken to Maynard nor ex-skipper Jamie Dalrymple before his own appointment.
BBC: Matthew Maynard resigns because of 'untenable' position
Spearman soon fell to Kenyan off-spinner Jamie Dalrymple with the score on 115 for four after hitting seven fours and three sixes.
The author William Dalrymple describes seeing Christians and Muslims praying together in a Greek Orthodox convent in Syria a few years ago.
Glamorgan's second innings began badly as they were reduced to 99-3, before Hemp and Dalrymple steadied the innings for the fourth wicket.
The director of cricket says he would be "very happy" to add another all-rounder to the complement Jamie Dalrymple and Jim Allenby.
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